Hello：
The following figure is the customer's design schematic diagram. The 3rd pin of the op amp is the input pin of the analog voltage, the input range is 0-5V, and the left pin of the F3 fuse is the circuit output pin, and the output range is 0-10V.
The current bad phenomenon is that there are a batch of bad ones. When the op amp 3 pin inputs 0-0.3V under no-load conditions, the voltage measured at the output pin is 0.3-0.6V. After the input voltage is greater than 0.3V, the output voltage becomes a linear amplification relationship.
Increase the load of 3MA at the output voltage point, this bad phenomenon disappears.
Replace the LM358 of two batches of 19 years and 22 years under no-load conditions, the number of samples is 5, and the output of the product is in a linear amplification relationship under the condition of 0-5V input.
The currently problematic product is the LM358 product with batch number "19K". This batch produces 1000 sets of products, and the single machine consumption is 4PCS. At present, the defective rate of the LM358 chip is judged to be 3.5%.
The customer wants to know whether TI's LM358 SOP8 package IC has a laser-engraved product as shown in Figure 1? If there is a product with this style, when did the laser engraving effect of the style shown in Figure 1 change? Is there any difference in performance parameters between Figure 1 and Figure 2?
At present, there are large-area defects in the production of laser-engraved chips that customers use in Figure 1.
Figure 1：
Figure 2：
